Lighting fixture



Feb. 18, 1941. q J. H, 'wA'rERBuRY LIGHTING FIXTURE 2 Sheets-Sheet 1Filed Nov. 12, 1933 U WNHlixlHi:

, 1941- J. H. WATERBURY 2,232,499 I LIGHTING, FIXTURE Filed Nov. 12,1938 2 Sheets-Sheet 2 rosettes. 18, 1941 h g I 2,232,499.

. John Waterbury; Chicago, 111., assigninto Benjamin Electric Mfg.Company, Des Plaines, Ill.,a corporation oi Illinois a Application Noember 12, 1938, Serial. 239,93

team, M

Thisinvention relatesto a. lighting fixture and oi barium or uranium..Also within the housing has for an object the provision of a fightingfl'xmay be positioned suitable transformers which ture that isparticularly adapted ior close iny be n ry for the successful op i ofspection work such asis encountered in the texe m ury vapor lamps. Thetubular light 8 tile and printing industries. g y

Various type of electric llghtgourcgs. and res the trough-shapedreflectors which extend lonflectors have;-been proposed, in the past.Re- E ln ly 01' the cently, however, tmercury arc vapor tube lamps v l ymounted edge to edge and the outside have come into extensive for. 1 mm;e edges 01' each oi the outside reflectors are pivotally v um-rapSTATE-sf PATENT cents in poses. ;These tubes and certain incandescentmounted on the housing so that. when a center 10 light. A

lamps generally take magnum, of elongated reflectords raiseliJor loweredwithin the housing, cy]1nder5, and it, consequently has become necestheoutside reflectors are tilted to 8. predetersary .to develop lightingfixtures cont inin mined extent whereby the light from thereflectorswhich will accommodate these sources 01' e s may be directed i v r dir ci n 7 s The trough-like reflectors may have-any suit- 15 .11; 1 ,"th' ffurth object, f this invenable cross section which will give the desiredlight tion. toiprovide a. lighting flxturet hi h may distribution. Inaccordance with one preferred used in conjunction-with anelongatedtubular emmdiment, h apex of h trough 1 source. shaped 'reflector isformed so that the light It isa further object of: this invention toproemitted fmm the tubular light swme'wm not be 20 Vlde-a.lightingflxture having a plurality of rereflected. back into'thetubeflectors whjqh may be focusgd within a For a more completeunderstanding of this in- ;-m1 vention, particular reference willnowbe-made j A t ni g t object of this invention is to to the drawings.A. housing It) may be provided prov! Qan a m 'n fi tur which is whichcontains a plurality of reflectors H, I2, 95 particularlyadaptable forillumlnating'unifcr l and I3. The reflectors have tubular light sourcesa predetermined with an mt n 11 ht l4, l5, and l6,'secured therein andextending in hlstili further object or this invention isto a a el alonjheretohe i t so rces c d a, e t which is particularly useful and Itmay be mounted at either end by a plurality 0 {of don t incandescentlamps or mercury of suitable separate sockets ll, l8, and I9. Within aretu es having an inside coatingot fl or s nt the housing and above thereflectors, suitable re.- t r uh as e t salts of barium or actantswitches 20, 2|, and- 22 may be mounted uranium f V which are employedin conjunction with the merobjects will appear from the following (Furym u ar light Sources an as description, the attached drawings, and theap- I The housing II is p o ded wi h false ends 23 pe e 1 g and 24 whichmay comprise a metal-sheet 2;,3 ri'm to the drawings. wherein a whichmay be faced with a sheet of polished alu- Fig. 1, 'is a partiallongitudinal .s ti nal view minum metal 24.. The false ends 23 ,and 24may or aflx ure constructed in accordance with one be-secured to theends of the housing In by any 40 embodiment otthis invention; i suitablemeans such as spot welding or the like. 6 5 Fig. 2 is a transversesectional view of the flx- The trough-like reflectors ll,- l-2, and I3extend ture shOwninFigJI; and 4 4 i Fig. 3 is adiagrammatic sketchindicating the in side-by-side relationship. They extend withinfmannerin .which light may be focused from the 'thehousing between thefalse ends 24 and are fixture as well as the-manner. in which the lightvertically movable therebetweent The reflectors g5 is reflected from thereflectorso as to not be re- 'may be surfaced with polished aluminum orother flected back to the source '01 light. I I suitable reflectingmaterial. All of the trough- In accordance with one embodiment oi'thisinshaped reflectorsmay be open at their ends so vention, the "fixturemay comprise a housing that the end plate 24 provides the reflectivesurwithin which maybe mounted a plurality oi" face ior the ends ofthe-reflectors. The outside to I troughped reflectors and tubularsources of reflectors H and i3 are pivotally mounted at light. Thetubular light sources may comprise their outside edges on rods 25 and26. These rodsv mercury vapor tubes which have been coated on extend theentire length 01' the reflector and the inside with a fluorescentmaterial. such as project through holes-provided in the falseend 1 anyone or, combination of the fluorescent salts plates arena 24 at eitherend of the housing In.

longitudinally oi the housing It and are mounted inside edges or .theoutside reflectors H and I3.

These rods extend the length of the reflector up to the end plate 24,but do not extend therethrough. The rods 21 and 28 are secured adjacentrods 29' and 30, positioned on the edges of the reflector l2, by meansof suitable straps 3| and 32. The straps 3| and 32 are firmly engagedwith the reflector |2 by means of suitable rivets 33 and 34. The strapsextend around'the rods 21 and 28, respectively, through holes punched inreflectors H and I3 so that the edges of the reflectors II and I2 andreflectors l2 and I3 are pivotally mounted with respect to each other.The straps engage the rods 21 and 28 only loosely so that there is alost motion in the pivotal relationship between the edges of thereflectors. The rods 29 and 39 at the edges of the reflector |2 extendthe length of the reflector and also pass through the end plates 23 and24 in suitable slots 35 and 38.

Thus, when the center reflector ismoved vertically within the housing,it follows the path predetermined by the slots 35 and 38 which guide therods 29 and 38. It will be observed that, when the center reflector I2is moved vertically,

the outside reflectors II and I3 will be tilted in the manner shown bythe dotted lines in Fig. 2. In this manner the direction of the lightfrom the various reflectors may be focused in accordance with thediagrammatic representation shown in Fig. 3.

In order that the center reflector may be conveniently raised andlowered in the manner previously indicated, it is secured at either endat the apex to a bracket 31 by means of suitable screws 38a. The bracketextends from the upper surface of the reflector |2 to the housing |Ibeyond the false end plates 23 and 24. The

bracket 31 is threadably engaged with a thumb screw 38' which extendsthrough a slot 33 provided in the housing Ill. The bracket 31 may thusbe moved along the inside surface of the housing H1 in accordance withthe direction of the -slot 39 and may be secured tightly in any desiredposition by tightening the thumb screw 38 down onto the outside ofthehousing Hi.

.It will be observed, therefore, that the center reflector l2 may thusbe readily moved in a vertical direction by raising andlowering thethumb screw attached to the bracket 31. The reflector may also besecured in any desired position by merely tightening the thumb screws38. A slot- 40 may be' provided in the end plates 23 and 24 in order toprovide a clearance for the strap 31 when the latter is lowered into theposition indicated by the dotted lines in Fig. 2.

The sockets l1, l8, and I9 are secured in fixed relationship to thereflectors and, consequently, the light sources l4, l5, and I3 and thesockets l1, l8, .and 19 also move with the reflectors I2, and I3.

, In order to provide a flrm support for the reflectors and theadjusting means, a pair of -U- shaped -channel bars 4| and 42 areprovided which extend the length of the housing In near the inside uppersurface thereof. The ends of the channel bars 4| and 42 extenddownwardly between the end walls of the housing l0 and the false ends 23and 24.. The" channel barsmay- A second pair of channel bars 43 andanother a not shown may be provided which extend transversely anddirectly underneath the channel bars 4| and 42. These channel barsextending crosswise of the fixture may have suitable plates 44 extendingbetween them, onto which may be positioned the reactant switches 20, 2|,The channel bar 43 may be secured to the channel bars 41 and 42 by spotwelding if desired. Theentire channel bar assembly may be suspended fromthe housing by means of suitable bolts 45, which may be threadablyengaged with the channel bar 43 and nuts ando washers 45apositionedoutside of the housing A -suitable means is provided forattaching the housing ID to any desired electrical outlet,

and 22.

which may comprise a flange 46 attached to the.

source. A reflector having this property may be obtained by forming theapex of the reflector -in such a manner that all of the light given allthetubular light source will be reflected away from the source of light.It will be recognized that the only light reflected back into the lightsource from the reflector comes from a region of thereflector-positioned back of the source of light. The curvature of thissurface, in accord- .ance with one embodiment of this invention,

may be designed to direct the light from the tubular light source awayfrom that source. A

desirable cross sectional shape of the trough reflector is shown in thefigures and more particularly in Fig. 3. The apex of the reflectivesurface-of the reflector is formed to produce a curvature such that thelight emitted from any portion of the surface of the light source willbereflected away from the light source. Thus,

a beam of light striking the reflector |2 at A and being emitted fromthe outside edge of the light source along its tangential line to A willbe-reflected along the line A-.-B. Consequently, any light emitted atany point from the light source, such as from the point C, will bereflected from A along the line A-D which does not strike the lightsource. Similarly, none of the light originating in the light sourcereflected from E passes through the light source. This type of reflectorhas been found to be particularly useful with fluorescent tube lamps,since no substantial portion of the light emitted therefrom is reflectedback into and absorbed by the light source itself.

It will be observed that a lighting fixture has been provided which iscapable of projecting a uniform amount of light over an extensive area.The light emitted from the fixture may be focused to smaller or largerareas by a simple adjusting While a. particular embodiment of thisinven-l tion is shown above, it will be 2. A lighting fixture comprisinganinverted trough-like reflector means, sockets within said trough-liketending longitudinally trough-like cover above said reflector means andcooperating with said eflector means to house sides 01' said covermember, the intermediate reflector member being movable up and down andconnected with the swinging edges of said pivoted reflector members.

3. A. lighting fixture comprising an inverted the swinging edges of saidpivoted reflector members.

4. A lighting fixture comprising an inverted trough-like reflectormeans, lamp sockets mounted bers; the two outside reflector membersbeing connected with the swinging edges reflector members.

JOHN H. WATERBURYJ trough-like reflector mem

